Hospitals, schools, companies and governments around the world were assessing the damage Saturday after a massive cyberattack hit almost 100 countries, infecting computers with malware that demanded ransom payments.No one has yet claimed responsibility for the worldwide attack, which some experts believe was inspired by a National Security Agency tool kit that was leaked last year.Antivirus provider Avast reported that some 100,000 computers had been infected by the crippling malware and that the "WanaCrypt0r 2.0," as it is called, ransomware had been detected in 99 countries with Russia, Ukraine and Taiwan the top targets.More than 20 British hospitals and major companies, including FedEx and Spain's largest telecom, were affected in Friday's hack.British Home Secretary Amber Rudd said 45 public health organizations had been hit and admitted that her officials had no idea who was behind the attack.Auto makers Renault and Nissan were the latest multinationals to announce their computer systems had been compromised.

In Germany, customer information screens at railway stations were hit but there was no impact on services.Russia's Interior Ministry also confirmed it had been hit, while Russia's central bank said it had thwarted the attack.The malicious software — known as the Wanna Decryptor, or WannaCry — locks a system and its files from use unless money is paid to hackers.bitcoin fools goldThe malware typically spreads through email phishing programs and had exploited a known bug in Microsoft Windows' operating system.raspberry pi bitcoin osIt is especially nasty because it acts like a worm — finding security holes in a computer to spread throughout a network.litecoin pool no feesComputer experts told NBC News that the leaked NSA tool kit demonstrated to the hackers how they could attack Windows systems.bitcoin mining mh/s

But they specified that whoever was behind the attack did not use an NSA ransomware tool as some media reports have suggested.Andrew Komarov, chief intelligence officer for the cybersecurity firm InfoArmor, said there was no indication that either WannaCry or Friday's attack had anything to do with the NSA "or any other state-sponsored cyber offensive activities."bitcoin core wallet fileIt was the size of the attack that shocked experts.bitcoin core vs electrum"The scale of it — that's pretty unprecedented," Ben Rapp, the CEO of IT support company Managed Networks, told NBC News' British partner ITV News.bitcoin sync with network"There's been a lot of ransomware in hospitals, but to see 16 hospitals, last time I looked, and reports of other people — this is probably the biggest ransomware attack we've seen."pt bitcoin indonesia

Microsoft said it was pushing out automatic Windows updates to defend its clients from the malware.This is a special case.Had @NSAGov disclosed the vuln when they discovered it, hospitals would have had years -- not months -- to prepare.https://t.co/HJj1TsfQYn— Edward Snowden (@Snowden) May 12, 2017 The U.S.china telecom bitcoinDepartment of Homeland Security said Microsoft released a patch to address the vulnerability in March and urged users to install it.Whistleblower Edward Snowden blamed the NSA for the damage, tweeting: "If @NSAGov had privately disclosed the flaw used to attack hospitals when they *found* it, not when they lost it, this may not have happened."In a statement, FedEx said that it was "experiencing interference with some of our Windows-based systems caused by malware.We are implementing remediation steps as quickly as possible."The Memphis, Tennessee-based global delivery company did not immediately say whether a ransom was demanded for return of their computers' functions.

Spanish telecom giant Telefonica confirmed in a statement that a "cybersecurity incident" occurred Friday that affected the computers at its Madrid headquarters.China's official news agency Xinhua said secondary schools and universities were hit, but did not say how many or identify them.It could take days before some affected systems are cleaned up.In a twist, a 22-year-old U.K.cybersecurity researcher, known online as MalwareTech, has been hailed as an "accidental hero" for halting the spread of the malware bug.The researcher reportedly identified a domain name in the malware virus and purchased the site, which acted as a "kill switch", according to ITV News.He told NBC News that he purchased the site to track the malware virus — not realizing it would stop it from spreading further.It is not the first time ransomware has been used, and sometimes, hackers hit the jackpot: Last year, Hollywood Presbyterian Medical Center forked over $17,000 after suffering a ransomware attack.Friday's demand — reportedly for $300 of digital currency Bitcoin — is relatively low, according to experts.

"It's a small ransom," said Gene Spafford, founder and executive director emeritus of Purdue University's Center for Education and Research in Information Assurance and Security."But if you set the price too high then many of their victims won't pay."Spafford said ransomware typically targets those without strong security in place, such as home users and small companies.The mayor of the small community of Timra, Sweden — population 10,000 — told Reuters it has "around 70" computers affected.Traders are happy because the SEC is expected to rule on a Bitcoin ETF by March 11.Meanwhile, Bloomberg reports  After assembling a research team in 2014, the People’s Bank of China has done trial runs of its prototype cryptocurrency.That’s taking it a step closer to becoming one of the first major central banks to issue digital money that can be used for anything from buying noodles to purchasing a car.At the same time as it builds up its own capabilities, the PBOC is increasing scrutiny of bitcoin and other private digital tenders.

It doesn’t want a bitcoin bubble to blow up.And since currencies have historically been issued by the state, not private players, it doesn’t want to cede the cryptocurrency space to companies it has no control over.Chinese people have embraced online payments for just about everything.To buy a can of Coke, thirsty commuters scan QR codes on their smartphones rather than feed coins into a vending machine.At Lunar New Year gatherings, money is exchanged via a few presses on a smartphone instead of crisp notes handed over in red envelopes.All of that poses a challenge to the PBOC’s status as the central bank of both the digital and physical realms.So if you can’t beat them, join them.“Getting to know more precisely how much banks lend, where the money goes and the pace of credit creation is key to curbing money laundering and making monetary policy more effective,” said Duan Xinxing, vice president of Beijing-based OKCoin Co., one of the country’s biggest bitcoin exchanges.Issuing digital currency will make it easier for the PBOC to monitor risk in the financial system and track transactions economy-wide, he said.

OKCoin is among cryptocurrency exchanges that has recently taken steps to halt bitcoin withdrawals amid efforts to clamp down on capital outflows.In January 2016, the PBOC said it will have its own cryptocurrency “soon,” but there has still been no formal start date announced.In the meantime, there’s been strong advocacy from senior officials, including Fan Yifei, one of the PBOC’s deputy governors.“Cutting costs is an obvious benefit, but the impact of shifting to blockchain-based digital money from the current payment structure goes beyond that,” said Larry Cao, director of content at the CFA Institute in Hong Kong.“There’s a potential you can pay anybody in the system, any bank, and any merchant directly.Blockchain will change the whole infrastructure.This is revolutionary.” For the PBOC, using blockchain, the technology that underpins the digital currency bitcoin, will allow it to trace transactions and collect “real-time, complete and authentic” data to compile precise monetary indicators such as money supply growth, OKCoin’s Duan said.